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2. Study Group
3. Difference between Multiply and Subtract word problem?

You can basically tell by just seeing the word "of". When you multiply any fraction by anything, you can replace the multiplication symbol with the word "of". You can also look for the word "left",...

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2. Study Group
3. can someone explain this to me? d cant be constant - its gonna change as a0 changes right?

That exercise seems really old. I don't know if it'll still be there. 

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2. General Khan Academy Questions
3. What is the Fastest Way to Earn Energy Points?

In my opinion, it is fastest to do coding challenges or watch videos. Those both don't take too long and give you a good amount of energy points.

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2. Study Group
3. Waste Water Math

You can contact someone at khan academy here: khankids@khanacademy.org.

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2. Study Group
3. I don't know if I am doing equations in the right way

Yes, you are doing it correctly.

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2. News and Updates from Khan Academy
3. News: Khan Academy hits 7 million YouTube subscribers!

CONGRATULATIONS! That is a huge milestone! Keep pushing for 10 MILLION subscribers. :)

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2. Study Group
3. PLEASE HELP

I recommend you take algebra 1 or 2, take get ready for precalculus, high school statistics and probability and high school geometry for math. For English. I suggest you take 9th grade English cour...

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2. Study Group
3. Algebra Basics vs Getting Ready for Algebra 1

I would do all the algebra courses, because they all have a meaning in the end. If you skip one course, it might be harder to fully master algebra concepts. I hope you found this useful. :)

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2. General Khan Academy Questions
3. How do I answer math questions with the drawing tool? Nothing seems to work even when I know the answer.

You should post those types of questions in the study group.

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2. Technical Issues and Workarounds
3. About 10% of videos incorrectly show as unfinished / incomplete.

Did you skip any part of the video? Because if you did, the video doesn't mark as complete.